CVSS CVSS Video Storage & Recording Systems

Question 1

What is the primary functional difference between a DVR and an NVR in a surveillance system?

Accepted Answer

DVRs process analog camera signals internally; NVRs record pre-encoded IP camera streams over a network

Answer

DVRs support IP cameras; NVRs support only analog cameras

Answer

DVRs provide higher resolution than NVRs

Answer

DVRs use cloud storage; NVRs use on-site hard drives

Question 2

In RAID 5 storage used for video surveillance, what is the minimum number of drives required?

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 3

A surveillance system stores video at 4 Mbps per camera. How much storage (in GB) is needed for 1 camera over 24 hours?

Accepted Answer

43.2 GB

Answer

28.8 GB

Answer

57.6 GB

Answer

86.4 GB

Question 4

Which video compression standard offers the best compression efficiency (smallest file size) at equivalent quality compared to H.264?

Accepted Answer

H.265 (HEVC)

Answer

MJPEG

Answer

MPEG-2

Answer

H.261

Question 5

What is the purpose of 'motion-based recording' in a video management system?

Accepted Answer

Record video only when the camera detects pixel change, reducing storage consumption

Answer

Continuously record all cameras regardless of activity

Answer

Trigger a PTZ camera to auto-track a moving subject

Answer

Increase frame rate automatically when motion is detected

Question 6

In surveillance storage planning, what does 'retention period' refer to?

Accepted Answer

The number of days recorded video is kept before being overwritten

Answer

The time it takes to retrieve archived footage from cloud storage

Answer

The maximum recording duration per camera per day

Answer

The backup cycle interval for offsite storage